EP3326758B1 - Power tool - Google Patents
Power tool Download PDFInfo
- Publication number
- EP3326758B1 EP3326758B1 EP16200989.8A EP16200989A EP3326758B1 EP 3326758 B1 EP3326758 B1 EP 3326758B1 EP 16200989 A EP16200989 A EP 16200989A EP 3326758 B1 EP3326758 B1 EP 3326758B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power tool
- switch
- turn
- illumination device
- mechanical device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005286 illumination Methods 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 9
- ALDJIKXAHSDLLB-UHFFFAOYSA-N 1,2-dichloro-3-(2,5-dichlorophenyl)benzene Chemical compound ClC1=CC=C(Cl)C(C=2C(=C(Cl)C=CC=2)Cl)=C1 ALDJIKXAHSDLLB-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000012858 resilient material Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
- B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/005—Auxiliary devices used in connection with portable grinding machines, e.g. holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
- B25F5/021—Construction of casings, bodies or handles with guiding devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention regards a power tool according to claim 1. That is a power tool comprising a mechanical device for setting a working parameter of said power tool, at least part of the mechanical device being visible and accessible from outside of the power tool by a user of the power tool, the power tool further comprising a printed circuit board and an illumination device with electrical contacts, the illumination device being adapted for illuminating at least that part of the mechanical device being visible from outside of the power tool.
- the illumination device comprises at least one LED, preferably two LEDs.
- the present invention is not limited to illumination devices comprising an LED.
- the expression power tool in the context of the present invention is referring to a tool that is powered by a non-manual energy source.
- the power tool in the context of the present invention can be stationary or handheld. Examples of such power tools would be a sander, a polisher, a drill or a saw.
- the preamble of claim 1 is known from US2010/0089601A1 .
- Other examples are known from US5561734A , WO2008/133339A1 , US2014/284070A1 , JP2015153626A , US2010/089601A1 and WO2013/187411A1 .
- the object of the present invention is to create a power tool that is reliably operating and in which the position for accommodating the illumination device and the mechanical device for setting the working parameter are highly variable.
- the power tool according to claim 1 is characterized in that the electrical contacts of the illumination device are indirectly connected to the printed circuit board via flexible wires.
- the electrical contacts in the form of rigid wires extending from the LED are directly attached to the circuit board, e.g. by soldering. These rigid wires then form an electrical connection between the circuit board and the LED as well as a mechanical mounting device for the LED.
- the rigid wires extending from the LED are therefore used for electrical connection and fastening or fixing of the LED on the circuit board at the same time.
- the LED When using the teaching of the current invention due to the flexible wires it is possible to arrange the LED at basically any desired positon within the housing of the power tool, irrespective of the position of the printed circuit board. Therefore the arrangement of the mechanical device for setting the working parameter which is supposed to be illuminated by the illumination device, e.g. the LED, can be placed on the power tool as desired.
- the flexible wires of the illumination device are connected to the printed circuit board by means of a connector or by soldering.
- the printed circuit board is equipped with an appropriate socket for receiving the connector.
- the flexible wires allow a movement of the illumination device, e.g. together with a movable part of the mechanical device for setting the working parameter of the power tool.
- the working element may comprise a turn-switch rotatable about an axis of rotation, and the illumination device can be rotated together with the turn-switch in order to provide for a constant illumination of the turn-switch.
- a further advantage of the present invention is the easier and faster mounting of the illumination device on the printed circuit board and assembly of the power tool.
- the illumination device can be electrically contacted with the printed circuit board.
- the electrically connected illumination device can be positioned within the desired part of the mechanical device to be illuminated in a desired position. Thereafter, the entire mechanical device can be easily positioned, mechanically fixed and electrically connected to the printed circuit board together with the illumination device, which has been previously electrically connected to the printed circuit board and positioned in respect to the mechanical device.
- the mechanical device comprises a potentiometer for setting the working parameter of the power tool and a turn-switch adapted to adjust a resistance value of the potentiometer and being located in the power tool such that it is visible and accessible from outside of the power tool by the user of the power tool.
- the illumination device is adapted for illuminating the turn-switch.
- the illumination device is in particular located within the turn-switch such that at least that part of the turn-switch visible and accessible from outside of the power tool is illuminated. This makes the power tool particularly easy to manage since the position and orientation of the turn-switch is always visible.
- the illumination device comprises at least one light emitting diode (LED).
- LED light emitting diode
- the flexible wires are stranded or braided wires. This gives enhanced durability and flexibility to the wires while electrical conductivity of the wires is also affected positively. Therefore a reliable and stable flexible electrical connection between the printed circuit board and the illumination device (e.g. one or more LEDs) is realized by the wires formed by stranded or braided wires.
- a further preferred embodiment of the current invention is characterized in that the mechanical device comprises a potentiometer, wherein the potentiometer comprises electrical contacts that are indirectly connected to the printed circuit board via flexible wires, preferably wherein the flexible wires are stranded or braided wires.
- the mechanical device comprises a potentiometer, wherein the potentiometer comprises electrical contacts that are indirectly connected to the printed circuit board via flexible wires, preferably wherein the flexible wires are stranded or braided wires.
- part of the mechanical device being visible from outside of the power tool, in particular the turn-switch is at least partially made of a translucent material allowing translucence of light emitted by the illumination device located inside the mechanical device. This allows that even in bad lighting conditions the position and alignment of the mechanical device for setting the working parameter on the power tool is easily recognized by an operator of the tool.
- the translucent material of that part of the mechanical device being visible from outside of the power tool, in particular of the turn-switch resembles numbers referring to certain values of the working parameters of the power tool if the mechanical device is set to these numbers.
- This embodiment allows for easy recognition of the currently set operating parameter even in bad lighting conditions.
- the mechanical device comprises a turn-switch, wherein the turn-switch is rotatable around an axis of rotation and the illumination device is accommodated within the turn-switch and preferably offset to the axis of ration.
- the turn-switch is not limited in its motion by the illumination device and the risk of damaging the illumination device when the turn-switch is rotated is also eliminated.
- the turn-switch has a contour which is substantially in the shape of a truncated cone. It is in this embodiment especially preferred, if the small end face side of the truncated cone is formed by a transparent material.
- the shaping of the turn-switch as a truncated cone makes it easily operable for example with the thumb of the operator of the power tool even in difficult conditions.
- the turn-switch comprises protrusions on its circumferential outer surface constituting a knurling structure. These protrusions provide enhanced grip to the operator of the power tool, when turning the turn-switch.
- the working parameter of said power tool is a driving speed of the power tool, i.e. the driving speed of the power tool can be adjusted via the mechanical device for setting the working parameter and preferably the turn-switch. Even more preferred is when the power tool has a rotating tool and the working parameter is the speed of rotation of this tool.
- the power tool is pneumatically or electrically powered and preferably hand-held or hand-guided.
- the installation of the illumination device, according to the described embodiments before offers significant advantages since especially hand-held devices are usually miniaturized and the smaller and more lightweight the device is the better. Therefore the arrangement of the illumination device according to the present invention allows further miniaturization of such a device.
- the power tool is one of a polisher and a sander, preferably an orbital polisher or sander, in particular a random orbital or a roto-orbital polisher or sander.
- An orbital sander is a sander in which the attachment for the sanding material is rotated in an orbit and a random orbital sander is such a type of sander in which the orbital motion of the sanding attachment is random, i.e. the advancement of the sanding attachment in each step is not prescribed. Rather the advancement of the sanding attachment is influenced by the amount of pressure with which the sanding attachment is pressed onto the surface to be sanded and the angle in which the power tool is held towards to the surface to be sanded.
- a power tool 10 according to the present invention is shown in an exploded view.
- the power tool is embodied as a sander, but could be embodied as any other type of power tool, too, e.g. as a polisher.
- the sander 10 comprises a housing 12 preferably made of a rigid material, such as plastic.
- the housing 12 comprises a bottom part 12a and a top part 12b detachably fixed to the bottom part 12a by means of a latching connection and/or screws 14.
- the bottom part 12a of the housing 12 comprises a palm pad 16, which is adapted to be gripped by a user with one hand when operating the power tool 10.
- the palm pad 16 preferably comprises an insert and is preferably made of resilient material such as an elastomer or rubber.
- the rear part of the housing 12 forms a grip section which can be gripped by the user with his other hand.
- the housing further comprises a lower section 18 below the palm pad 16 with an enlarged diameter.
- the lower section 18 is adapted for receiving a working element (backing pad with a sanding paper or in the case of a polisher with a polishing pad) for working the surface of a workpiece, such as the body of a vehicle or the hull of a boat.
- a suction bonnet 20 preferably made of resilient material can be connected to the lower section 18 of the housing 12.
- the suction bonnet 20 has an annular shape and comprises a suction nozzle 22 located circumferentially and directed radially towards the outside.
- the suction nozzle 22 can be connected to a suction spout 24 adapted for being releasably fixed to the bottom of the housing 12, e.g. by means of a screw 24a.
- the spout 24 comprises a hose adapter 26 for connecting the spout 24 and hence the entire suction elements 20, 22 to the hose of a vacuum cleaner for aspirating dust or other fine particles occurring during working the work piece.
- An electric motor (not shown) of the tool 10 is located in the housing 12, preferably within or under the palm pad 16.
- the motor serves for making the working element of the tool 10 perform an actuating movement, which may be e.g. a purely rotary, a roto-orbital or a random-orbital actuating movement.
- one or more gear mechanisms can be located functionally between the motor shaft and the working element, in order to translate the rotational movement of the motor shaft into the desired actuating movement of the working element.
- the electric motor is powered with electricity provided to the power tool 10 by means of a power cord 28 comprising three wires 30.
- the power cord 28 is introduced into the housing 12 from the rear end by means of a sealing grommet 32, preferably made of a resilient material and clamped between the two parts 12a and 12b of the housing 12 when fixed together.
- a strain-relief element 34 is located in the housing 12, which is releasably fixed to the housing 12 by means of screws 34a.
- the upper part 12a of the housing 12 comprises an on/off switch 36 and an actuating lever 38 pivotably fixed to the upper part 12a.
- the lever 38 is pivotable about an axis defined by a turning shaft 40 against the force of a spring element 42.
- the actuating lever 38 serves for starting and stopping operation of the working element and for controlling the speed of the working element's actuating movement.
- the lever 38 can be pressed down by the user with the same hand which also rests on the palm pad 16.
- a printed circuit board (PCB) 44 is accommodated in the housing 12, more specifically between the lower part 12a and the upper part 12b of the housing 12, a printed circuit board (PCB) 44 is accommodated.
- the PCB 44 comprises a control unit 46 for the power tool 10.
- the control unit 46 may comprise a microprocessor.
- the PCB 44 further comprises several circuit paths and a plurality of electronic components for realizing the control unit's functionality.
- a surface mounted switching element 48 is located on the PCB 44, which is in connection with the on/off switch 36, when the power tool 10 is assembled.
- the PCB 44 comprises electric sockets to which the wires 30 of the power cable 28 are connected for providing the tool 10, its control unit 46 and the electric motor with electric energy.
- the power tool 10 also comprises a mechanical device 50 for setting a working parameter of the power tool.
- the working parameter can be, e.g. a maximum speed of the working element, if the actuating lever 38 is completely pressed down during operation of the tool 10.
- the mechanical device 50 comprises a turn-switch 52 being visible and accessible from outside of the power tool 10. In particular, when the power tool 10 is assembled, the turn-switch 52 protrudes through an opening 54 in the bottom part 12a of the housing 12. Of course, the visible part of the mechanical device 50 could be visible and accessible at any other position of the housing 12, too.
- the turn-switch 52 is connected to a potentiometer 56. By actuating the turn-switch 52, in particular by rotating it about an axis 58 of rotation, the resistance of the potentiometer 56 can be adjusted to a desired value corresponding to or representative of the desired value the working parameter.
- the potentiometer 56 is connected to the printed circuit board 44 via three flexible wires 60.
- the flexible wires 60 are stranded wires.
- the potentiometer 56 is covered by a cover 62 having a through hole 62a in order to allow the turning movement of the turn-switch 52 to be transferred to the potentiometer 56.
- the cover 62 is shown in more detail in figure 4 .
- the power tool 10 further comprises an illumination device 64, that is symbolically shown in figure 1 .
- the tool 10 could also comprise more than one illumination device 64.
- the illumination device 64 is accommodated within the turn-switch 52 and is placed offset to the axis of rotation 58.
- the cover 62 comprises a receiving hole 62b located offset to the axis 58 near the outside of the cover 62.
- the illumination device 50 is located inside the receiving hole 62b.
- the illumination device 50 serves for illuminating the turn-switch 52 from the inside.
- the turn-switch 52 comprises transparent sections 65 allowing translucence of the light emitted by the illumination device 64.
- the transparent sections 65 are made of translucent material preferably resembling numbers referring to certain values of the working parameters of the power tool 10 if the mechanical device 50 is set to these numbers.
- the illumination device 64 is, just as the potentiometer 56, connected to the printed circuit board 44 via flexible wires that are preferably stranded wires and are not separately shown in figure 1 .
- FIG 2 an alternative embodiment of the mechanical device 50 for setting the working parameter is shown.
- the turn-switch 52 is substantially in the shape of a truncated cone (see figure 3 ).
- a circumferential wall 66 of the turn-switch 52 is constructed of untransparent (opaque) material while the transparent sections 65 are made of translucent material. Further translucent sections 65 could also be provided in the turn-switch 52, e.g. a bottom face 68.
- the illumination device 64 comprises two LEDs 70. Both of the LEDs 70 are accommodated within the turn-switch 52, preferably within appropriate receiving holes 62b of a cover 62, and arranged offset to the axis of rotation 58 of the turn-switch 52. When the illumination device 64 emits light, then this light is blocked off by the untransparent circumferential walls 66, but can pass the translucent sections 65 of the turn-switch 52. Both LEDs 70 comprise electrical contacts 72.
- the electrical contacts 72 are solid wires extending out of the LEDs 70 and forming part of the LEDs 70.
- the LEDs 70 are indirectly connected to the printed circuit board 44 by flexible wires 74, i.e. the flexible wires 74 connect the electrical contacts 72 to the printed circuit board 44.
- An electric and/or electronic component 76 as well as two heat sinks 78 are directly connected to the printed circuit board 44.
- wires 80 are preferably rigid wires, each containing a single conducting strand.
- the turn-switch 52 comprises protrusions 82 on its circumferential outer surface 66 constituting a knurling structure, for an enhanced grip and an easier actuation of the turn-switch 52 by a user.
- the protrusions 82 are arranged in groups 84 wherein in the individual groups 84 of protrusions 82 are separated by smoothed sections of the circumferential surface 66, where the transparent sections 65 are realized.
- Figure 3 shows the mechanical device 50 of figure 2 in a perspective view. It is well visible that the printed circuit board 44 has a frame 86 around its circumferential edge and attached to that frame are connecting feet 88, which allow for easy installation of the printed circuit board 44 in the housing 12 of the power tool 10.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
- The present invention regards a power tool according to claim 1. That is a power tool comprising a mechanical device for setting a working parameter of said power tool, at least part of the mechanical device being visible and accessible from outside of the power tool by a user of the power tool, the power tool further comprising a printed circuit board and an illumination device with electrical contacts, the illumination device being adapted for illuminating at least that part of the mechanical device being visible from outside of the power tool. In the context of the present invention it is preferred if the illumination device comprises at least one LED, preferably two LEDs. However, the present invention is not limited to illumination devices comprising an LED. The expression power tool in the context of the present invention is referring to a tool that is powered by a non-manual energy source. The power tool in the context of the present invention can be stationary or handheld. Examples of such power tools would be a sander, a polisher, a drill or a saw. The preamble of claim 1 is known from
US2010/0089601A1 . Other examples are known fromUS5561734A ,WO2008/133339A1 ,US2014/284070A1 ,JP2015153626A US2010/089601A1 andWO2013/187411A1 . - From power tools available on the market it is known to attach the illumination device rigidly and unmovably to the circuit board, like it is described in detail in
DE 10 2010 013 783 A1 - This problem is solved by a power tool according to the present invention. The power tool according to claim 1 is characterized in that the electrical contacts of the illumination device are indirectly connected to the printed circuit board via flexible wires. In the prior art, especially when the illumination device is constituted by an LED, the electrical contacts in the form of rigid wires extending from the LED are directly attached to the circuit board, e.g. by soldering. These rigid wires then form an electrical connection between the circuit board and the LED as well as a mechanical mounting device for the LED. The rigid wires extending from the LED are therefore used for electrical connection and fastening or fixing of the LED on the circuit board at the same time. However, as described above, this limits the possibilities for arranging the LED. When using the teaching of the current invention due to the flexible wires it is possible to arrange the LED at basically any desired positon within the housing of the power tool, irrespective of the position of the printed circuit board. Therefore the arrangement of the mechanical device for setting the working parameter which is supposed to be illuminated by the illumination device, e.g. the LED, can be placed on the power tool as desired.
- Preferably, the flexible wires of the illumination device are connected to the printed circuit board by means of a connector or by soldering. In the case of a connector, the printed circuit board is equipped with an appropriate socket for receiving the connector. In that way a damaged illumination device can be easily replaced by a properly functioning illumination device. Furthermore, the flexible wires allow a movement of the illumination device, e.g. together with a movable part of the mechanical device for setting the working parameter of the power tool. In particular, the working element may comprise a turn-switch rotatable about an axis of rotation, and the illumination device can be rotated together with the turn-switch in order to provide for a constant illumination of the turn-switch.
- A further advantage of the present invention is the easier and faster mounting of the illumination device on the printed circuit board and assembly of the power tool. To start with the illumination device can be electrically contacted with the printed circuit board. Then the electrically connected illumination device can be positioned within the desired part of the mechanical device to be illuminated in a desired position. Thereafter, the entire mechanical device can be easily positioned, mechanically fixed and electrically connected to the printed circuit board together with the illumination device, which has been previously electrically connected to the printed circuit board and positioned in respect to the mechanical device.
- According to claim 1, the mechanical device comprises a potentiometer for setting the working parameter of the power tool and a turn-switch adapted to adjust a resistance value of the potentiometer and being located in the power tool such that it is visible and accessible from outside of the power tool by the user of the power tool. This constitutes an advantageous embodiment of the mechanical device.
- Also according to claim 1, the illumination device is adapted for illuminating the turn-switch. The illumination device is in particular located within the turn-switch such that at least that part of the turn-switch visible and accessible from outside of the power tool is illuminated. This makes the power tool particularly easy to manage since the position and orientation of the turn-switch is always visible.
- It is furthermore advantageous, if the illumination device comprises at least one light emitting diode (LED). By this the illumination device can be designed particularly compact and on top of this is especially energy efficient. According to a preferred embodiment of the current invention the flexible wires are stranded or braided wires. This gives enhanced durability and flexibility to the wires while electrical conductivity of the wires is also affected positively. Therefore a reliable and stable flexible electrical connection between the printed circuit board and the illumination device (e.g. one or more LEDs) is realized by the wires formed by stranded or braided wires.
- A further preferred embodiment of the current invention is characterized in that the mechanical device comprises a potentiometer, wherein the potentiometer comprises electrical contacts that are indirectly connected to the printed circuit board via flexible wires, preferably wherein the flexible wires are stranded or braided wires. This preferred embodiment not only allows a very flexible placement of the illumination device but also of the potentiometer. By this the flexibility of the arrangement of the mechanical device for setting the working parameter is increased even further.
- In a further preferred embodiment of the current invention part of the mechanical device being visible from outside of the power tool, in particular the turn-switch, is at least partially made of a translucent material allowing translucence of light emitted by the illumination device located inside the mechanical device. This allows that even in bad lighting conditions the position and alignment of the mechanical device for setting the working parameter on the power tool is easily recognized by an operator of the tool.
- Preferably the translucent material of that part of the mechanical device being visible from outside of the power tool, in particular of the turn-switch, resembles numbers referring to certain values of the working parameters of the power tool if the mechanical device is set to these numbers. This embodiment allows for easy recognition of the currently set operating parameter even in bad lighting conditions.
- It is also preferred when the mechanical device comprises a turn-switch, wherein the turn-switch is rotatable around an axis of rotation and the illumination device is accommodated within the turn-switch and preferably offset to the axis of ration. By this arrangement the turn-switch is not limited in its motion by the illumination device and the risk of damaging the illumination device when the turn-switch is rotated is also eliminated.
- It is furthermore preferred, if the turn-switch has a contour which is substantially in the shape of a truncated cone. It is in this embodiment especially preferred, if the small end face side of the truncated cone is formed by a transparent material. The shaping of the turn-switch as a truncated cone makes it easily operable for example with the thumb of the operator of the power tool even in difficult conditions.
- It is furthermore preferred, when the turn-switch comprises protrusions on its circumferential outer surface constituting a knurling structure. These protrusions provide enhanced grip to the operator of the power tool, when turning the turn-switch.
- It is preferred when the working parameter of said power tool is a driving speed of the power tool, i.e. the driving speed of the power tool can be adjusted via the mechanical device for setting the working parameter and preferably the turn-switch. Even more preferred is when the power tool has a rotating tool and the working parameter is the speed of rotation of this tool.
- It is also preferred when the power tool is pneumatically or electrically powered and preferably hand-held or hand-guided. Especially for the described devices the installation of the illumination device, according to the described embodiments before, offers significant advantages since especially hand-held devices are usually miniaturized and the smaller and more lightweight the device is the better. Therefore the arrangement of the illumination device according to the present invention allows further miniaturization of such a device.
- Further preferably, the power tool is one of a polisher and a sander, preferably an orbital polisher or sander, in particular a random orbital or a roto-orbital polisher or sander. An orbital sander is a sander in which the attachment for the sanding material is rotated in an orbit and a random orbital sander is such a type of sander in which the orbital motion of the sanding attachment is random, i.e. the advancement of the sanding attachment in each step is not prescribed. Rather the advancement of the sanding attachment is influenced by the amount of pressure with which the sanding attachment is pressed onto the surface to be sanded and the angle in which the power tool is held towards to the surface to be sanded.
- Figure 1
- shows a power tool according to the present invention in an exploded view;
- figure 2
- shows a mechanical device for setting the working parameter of a such a power tool in a top view;
- figure 3
- shows the mechanical device for setting the working parameter of
figure 2 in an perspective view; and - figure 4
- a cover as part of the mechanical device according to
figures 2 and3 . - In
figure 1 apower tool 10 according to the present invention is shown in an exploded view. The power tool is embodied as a sander, but could be embodied as any other type of power tool, too, e.g. as a polisher. Thesander 10 comprises ahousing 12 preferably made of a rigid material, such as plastic. Thehousing 12 comprises abottom part 12a and atop part 12b detachably fixed to thebottom part 12a by means of a latching connection and/or screws 14. In its front part, thebottom part 12a of thehousing 12 comprises apalm pad 16, which is adapted to be gripped by a user with one hand when operating thepower tool 10. Thepalm pad 16 preferably comprises an insert and is preferably made of resilient material such as an elastomer or rubber. The rear part of thehousing 12 forms a grip section which can be gripped by the user with his other hand. The housing further comprises alower section 18 below thepalm pad 16 with an enlarged diameter. Thelower section 18 is adapted for receiving a working element (backing pad with a sanding paper or in the case of a polisher with a polishing pad) for working the surface of a workpiece, such as the body of a vehicle or the hull of a boat. Asuction bonnet 20 preferably made of resilient material can be connected to thelower section 18 of thehousing 12. Thesuction bonnet 20 has an annular shape and comprises asuction nozzle 22 located circumferentially and directed radially towards the outside. Thesuction nozzle 22 can be connected to asuction spout 24 adapted for being releasably fixed to the bottom of thehousing 12, e.g. by means of ascrew 24a. At its distal end thespout 24 comprises ahose adapter 26 for connecting thespout 24 and hence theentire suction elements power tool 10 and can be clearly monitored by the user. Furthermore, health risks for the user of thepower tool 10 due to the fine particles in the air surrounding the working area can be avoided. - An electric motor (not shown) of the
tool 10 is located in thehousing 12, preferably within or under thepalm pad 16. The motor serves for making the working element of thetool 10 perform an actuating movement, which may be e.g. a purely rotary, a roto-orbital or a random-orbital actuating movement. If necessary, one or more gear mechanisms (not shown) can be located functionally between the motor shaft and the working element, in order to translate the rotational movement of the motor shaft into the desired actuating movement of the working element. The electric motor is powered with electricity provided to thepower tool 10 by means of apower cord 28 comprising threewires 30. Thepower cord 28 is introduced into thehousing 12 from the rear end by means of a sealinggrommet 32, preferably made of a resilient material and clamped between the twoparts housing 12 when fixed together. Immediately after the grommet 32 a strain-relief element 34 is located in thehousing 12, which is releasably fixed to thehousing 12 by means ofscrews 34a. - The
upper part 12a of thehousing 12 comprises an on/offswitch 36 and anactuating lever 38 pivotably fixed to theupper part 12a. Thelever 38 is pivotable about an axis defined by a turningshaft 40 against the force of aspring element 42. With thepower tool 10 turned on (switch 36 in the on-position), the actuatinglever 38 serves for starting and stopping operation of the working element and for controlling the speed of the working element's actuating movement. Thelever 38 can be pressed down by the user with the same hand which also rests on thepalm pad 16. - In the
housing 12, more specifically between thelower part 12a and theupper part 12b of thehousing 12, a printed circuit board (PCB) 44 is accommodated. ThePCB 44 comprises acontrol unit 46 for thepower tool 10. Thecontrol unit 46 may comprise a microprocessor. ThePCB 44 further comprises several circuit paths and a plurality of electronic components for realizing the control unit's functionality. For example, a surface mounted switchingelement 48 is located on thePCB 44, which is in connection with the on/offswitch 36, when thepower tool 10 is assembled. Furthermore, thePCB 44 comprises electric sockets to which thewires 30 of thepower cable 28 are connected for providing thetool 10, itscontrol unit 46 and the electric motor with electric energy. - The
power tool 10 also comprises amechanical device 50 for setting a working parameter of the power tool. The working parameter can be, e.g. a maximum speed of the working element, if the actuatinglever 38 is completely pressed down during operation of thetool 10. Themechanical device 50 comprises a turn-switch 52 being visible and accessible from outside of thepower tool 10. In particular, when thepower tool 10 is assembled, the turn-switch 52 protrudes through anopening 54 in thebottom part 12a of thehousing 12. Of course, the visible part of themechanical device 50 could be visible and accessible at any other position of thehousing 12, too. The turn-switch 52 is connected to apotentiometer 56. By actuating the turn-switch 52, in particular by rotating it about anaxis 58 of rotation, the resistance of thepotentiometer 56 can be adjusted to a desired value corresponding to or representative of the desired value the working parameter. - The
potentiometer 56 is connected to the printedcircuit board 44 via threeflexible wires 60. In the present embodiment theflexible wires 60 are stranded wires. In the assembled state of thepower tool 10 thepotentiometer 56 is covered by acover 62 having a throughhole 62a in order to allow the turning movement of the turn-switch 52 to be transferred to thepotentiometer 56. Thecover 62 is shown in more detail infigure 4 . - The
power tool 10 further comprises anillumination device 64, that is symbolically shown infigure 1 . Of course, thetool 10 could also comprise more than oneillumination device 64. In the assembled state of thetool 10 according to the described embodiment theillumination device 64 is accommodated within the turn-switch 52 and is placed offset to the axis ofrotation 58. In particular, thecover 62 comprises a receivinghole 62b located offset to theaxis 58 near the outside of thecover 62. During assembly of thepower tool 10 theillumination device 50 is located inside the receivinghole 62b. Theillumination device 50 serves for illuminating the turn-switch 52 from the inside. The turn-switch 52 comprisestransparent sections 65 allowing translucence of the light emitted by theillumination device 64. As shown in more detail infigure 3 , thetransparent sections 65 are made of translucent material preferably resembling numbers referring to certain values of the working parameters of thepower tool 10 if themechanical device 50 is set to these numbers. Theillumination device 64 is, just as thepotentiometer 56, connected to the printedcircuit board 44 via flexible wires that are preferably stranded wires and are not separately shown infigure 1 . - In
figure 2 an alternative embodiment of themechanical device 50 for setting the working parameter is shown. The turn-switch 52 is substantially in the shape of a truncated cone (seefigure 3 ). Acircumferential wall 66 of the turn-switch 52 is constructed of untransparent (opaque) material while thetransparent sections 65 are made of translucent material. Furthertranslucent sections 65 could also be provided in the turn-switch 52, e.g. abottom face 68. - In the embodiment of
figure 2 theillumination device 64 comprises twoLEDs 70. Both of theLEDs 70 are accommodated within the turn-switch 52, preferably within appropriate receivingholes 62b of acover 62, and arranged offset to the axis ofrotation 58 of the turn-switch 52. When theillumination device 64 emits light, then this light is blocked off by the untransparentcircumferential walls 66, but can pass thetranslucent sections 65 of the turn-switch 52. BothLEDs 70 compriseelectrical contacts 72. Theelectrical contacts 72 are solid wires extending out of theLEDs 70 and forming part of theLEDs 70. TheLEDs 70 are indirectly connected to the printedcircuit board 44 byflexible wires 74, i.e. theflexible wires 74 connect theelectrical contacts 72 to the printedcircuit board 44. An electric and/orelectronic component 76 as well as twoheat sinks 78 are directly connected to the printedcircuit board 44. - Electrical connections of the printed
circuit board 44 are implemented bywires 80, which are preferably rigid wires, each containing a single conducting strand. - The turn-
switch 52 comprisesprotrusions 82 on its circumferentialouter surface 66 constituting a knurling structure, for an enhanced grip and an easier actuation of the turn-switch 52 by a user. Theprotrusions 82 are arranged ingroups 84 wherein in theindividual groups 84 ofprotrusions 82 are separated by smoothed sections of thecircumferential surface 66, where thetransparent sections 65 are realized. -
Figure 3 shows themechanical device 50 offigure 2 in a perspective view. It is well visible that the printedcircuit board 44 has aframe 86 around its circumferential edge and attached to that frame are connectingfeet 88, which allow for easy installation of the printedcircuit board 44 in thehousing 12 of thepower tool 10.
Claims (12)
- Power tool (10) comprising a mechanical device (50) for setting a working parameter of said power tool (10), at least part of the mechanical device (50) being visible and accessible from outside of the power tool (10) by a user of the power tool (10), the power tool (10) further comprising a printed circuit board (44) and an illumination device (64) with electrical contacts (72), the illumination device (64) being adapted for illuminating at least that part of the mechanical device (50) being visible from outside of the power tool (10), the electrical contacts (72) of the illumination device (64) are indirectly connected to the printed circuit board (44) via flexible wires (74),
characterized in thatthe illumination of the mechanical device (50) by the illumination device (64) allows an operator of the power tool (10) to easily recognize a position and alignment of the mechanical device (50) for setting the working parameter on the power tool (10) and thatthe mechanical device (50) comprises a potentiometer (56) for setting the working parameter of the power tool (10) and a turn-switch (52) adapted to adjust a resistance value of the potentiometer (56) and being located in the power tool (10) such that it is visible and accessible from outside of the power tool (10) by the user of the power tool (10),wherein the illumination device (64) is adapted for illuminating the turn-switch (52). - Power tool (10) according to claim 1, characterized in that the illumination device (64) comprises at least one light emitting diode (70).
- Power tool (10) according to one of the preceding claims, characterized in that the flexible wires (74) are stranded or braided wires.
- Power tool (10) according to one of the preceding claims, characterized in that the potentiometer (56) comprises electrical contacts that are indirectly connected to the printed circuit board (44) via flexible wires (60), preferably wherein the flexible wires (60) are stranded or braided wires.
- Power tool (10) according to one of the preceding claims, characterized in that the turn-switch (52) is at least partially made of a translucent material (65) allowing translucence of light emitted by the illumination device (64) located inside the mechanical device (50).
- Power tool (10) according to claim 5, characterized in that that the translucent material (65) of part of the turn-switch (52) resembles numbers referring to certain values of the working parameters of the power tool (10) if the mechanical device (50) is set to these numbers.
- Power tool (10) according to one of the preceding claims, characterized in that the turn-switch (52) is rotatable around an axis of rotation (58) and the illumination device (64) is accommodated within the turn-switch (52) and preferably offset to the axis of ration (58).
- Power tool (10) according to one of the preceding claims, characterized in that the turn-switch (52) has a contour which is substantially in the shape of a truncated cone.
- Power tool (10) according to one of the preceding claims, characterized in that the turn-switch (52) comprises protrusions (82) on its circumferential outer surface (66) constituting a knurling structure.
- Power tool (10) according to one of the preceding claims, characterized in that the working parameter of said power tool (10) set by the mechanical device (50) is a driving speed of the power tool (10).
- Power tool (10) according to one of the preceding claims, characterized in that the power tool (10) is electrically powered and hand-held or hand-guided.
- Power tool (10) according to one of the preceding claims, characterized in that the power tool (10) is one of a polisher and a sander, preferably an orbital polisher or sander, in particular a random orbital or a roto-orbital polisher or sander.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16200989.8A EP3326758B1 (en) | 2016-11-28 | 2016-11-28 | Power tool |
CN201711194891.9A CN108115620A (en) | 2016-11-28 | 2017-11-24 | Power tool |
US15/822,520 US20180147686A1 (en) | 2016-11-28 | 2017-11-27 | Power tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16200989.8A EP3326758B1 (en) | 2016-11-28 | 2016-11-28 | Power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3326758A1 EP3326758A1 (en) | 2018-05-30 |
EP3326758B1 true EP3326758B1 (en) | 2022-08-10 |
Family
ID=57421716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16200989.8A Active EP3326758B1 (en) | 2016-11-28 | 2016-11-28 | Power tool |
Country Status (3)
Country | Link |
---|---|
US (1) | US20180147686A1 (en) |
EP (1) | EP3326758B1 (en) |
CN (1) | CN108115620A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019112556A1 (en) * | 2019-05-14 | 2020-11-19 | Ferrobotics Compliant Robot Technology Gmbh | ORBITAL GRINDING MACHINE WITH BRAKE DEVICE |
USD1024470S1 (en) * | 2021-05-18 | 2024-04-23 | Bissell Inc. | Vacuum cleaner accessory tool |
DE102022134161A1 (en) * | 2021-12-22 | 2023-06-22 | Festool Gmbh | Hand machine tool with handle housing part that can be mounted in angular positions |
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US5561734A (en) * | 1992-08-13 | 1996-10-01 | Milwaukee Electric Tool Corporation | Dial speed control for hand-held power tool |
US20100089601A1 (en) * | 2008-10-09 | 2010-04-15 | Masatoshi Fukinuki | Power tool having an illuminated torque calibration indicator |
WO2013187411A1 (en) * | 2012-06-12 | 2013-12-19 | 日立工機株式会社 | Power-driven device, power-driven-device system, and electric-power-tool management system |
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DE602006001345D1 (en) * | 2005-11-01 | 2008-07-10 | Black & Decker Inc | Encoding unit with resistors for a wiring harness |
DE102005000161A1 (en) * | 2005-11-21 | 2007-05-24 | Hilti Ag | Hand tool with foamed wiring |
DE202006004934U1 (en) * | 2006-03-28 | 2007-08-02 | Robert Bosch Gmbh | Battery powered hand tool has an integral standing support foot with accessory controls |
DE102006045157B4 (en) * | 2006-09-25 | 2020-06-18 | Robert Bosch Gmbh | Hand tool |
JP5146717B2 (en) * | 2007-04-23 | 2013-02-20 | 日立工機株式会社 | Electric tool |
US8016048B2 (en) * | 2007-04-23 | 2011-09-13 | Hitachi Koki Co., Ltd. | Electrical power tool |
US7722435B2 (en) * | 2007-06-13 | 2010-05-25 | Black & Decker Inc. | Sander |
DE102010013783B4 (en) | 2010-04-03 | 2013-11-21 | Festool Group Gmbh & Co. Kg | Lighting device with LEDs |
US9457462B2 (en) * | 2012-05-02 | 2016-10-04 | Milwaukee Electric Tool Corporation | Power tool having a speed selector switch |
US20140284070A1 (en) * | 2012-06-08 | 2014-09-25 | Black & Decker Inc. | Operating mode indicator for a power tool |
US20140073229A1 (en) * | 2012-09-08 | 2014-03-13 | Ssdb, Llc | Interchangeable Polishing and Buffing Device |
US9787159B2 (en) * | 2013-06-06 | 2017-10-10 | Milwaukee Electric Tool Corporation | Brushless DC motor configuration for a power tool |
JP5773001B2 (en) * | 2014-02-14 | 2015-09-02 | オムロン株式会社 | Contact mechanism, trigger switch using the same, and electric tool |
-
2016
- 2016-11-28 EP EP16200989.8A patent/EP3326758B1/en active Active
-
2017
- 2017-11-24 CN CN201711194891.9A patent/CN108115620A/en active Pending
- 2017-11-27 US US15/822,520 patent/US20180147686A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5561734A (en) * | 1992-08-13 | 1996-10-01 | Milwaukee Electric Tool Corporation | Dial speed control for hand-held power tool |
US20100089601A1 (en) * | 2008-10-09 | 2010-04-15 | Masatoshi Fukinuki | Power tool having an illuminated torque calibration indicator |
WO2013187411A1 (en) * | 2012-06-12 | 2013-12-19 | 日立工機株式会社 | Power-driven device, power-driven-device system, and electric-power-tool management system |
Also Published As
Publication number | Publication date |
---|---|
US20180147686A1 (en) | 2018-05-31 |
CN108115620A (en) | 2018-06-05 |
EP3326758A1 (en) | 2018-05-30 |
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